Interplay between Angular-Dependent Magnetoresistance Oscillation and Charge-Ordered States in the Organic Conductor β′′-(ET)(TCNQ)

In this paper, we report on the effect of pressure on the angular-dependent magnetoresistance and Shubnikov–de Haas (SdH) oscillation for β′′-(ET)(TCNQ), where ET and TCNQ stand for bis(ethylenedithio)tetrathiafulvalene and tetracyanoquinodimethane, respectively. At 0 kbar, the temperature dependenc...

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Bibliographic Details
Published in:Journal of the Physical Society of Japan 2024-09, Vol.93 (9), p.1
Main Authors: Yasuzuka, Syuma, Uji, Shinya, Terashima, Taichi, Konoike, Takako, Graf, David, Choi, Eun Sang, Brooks, James S, Yamamoto, Hiroshi M, Kato, Reizo
Format: Article
Language:English
Subjects:
Anomalies
Charge density waves
Fermi surfaces
Interlayers
Low temperature
Low temperature resistance
Magnetoresistance
Magnetoresistivity
Phase diagrams
Pressure dependence
Pressure effects
Temperature dependence
Tetracyanoquinodimethane
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Summary:In this paper, we report on the effect of pressure on the angular-dependent magnetoresistance and Shubnikov–de Haas (SdH) oscillation for β′′-(ET)(TCNQ), where ET and TCNQ stand for bis(ethylenedithio)tetrathiafulvalene and tetracyanoquinodimethane, respectively. At 0 kbar, the temperature dependence of the interlayer resistance shows three hump anomalies at around T1 = 174 K, T2 = 72 K, and T3 = 22 K. At low temperatures below T3, both the Yamaji oscillation and the periodic dip structure due to a commensurability effect are clearly observed in the angular dependence of the interlayer resistance at high magnetic fields. At 2.0 kbar, the T1-anomaly is suppressed and the T2- and T3-anomalies shift to lower temperatures. Below T3, a similar Yamaji oscillation and the dip structure are evident. At 5.1 kbar, the T3-anomaly is removed, and only the dip structure is clearly observed at low temperatures. From this finding, the dip structure is attributable to a commensurability effect between the possible 4kF charge-density wave in the TCNQ layers and the interlayer lattice potential. Although no Yamaji oscillation is observed at 5.1 kbar, a higher SdH frequency than that at 0 kbar is detected, suggesting the emergence of a magnetic breakdown orbit in the significantly undulated Fermi surface originating from the ET layers. The temperature–pressure phase diagram of β′′-(ET)(TCNQ) is determined from the resistance measurements.
ISSN:0031-9015
1347-4073
DOI:10.7566/JPSJ.93.094708